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In-App Subscriptions Made Easy

There are various types of subscriptions: recurring, non-recurring, free-trial periods, various billing cycles and any possible billing variation one can imagine. But with lack of information online, you might discover that mobile subscriptions behave differently from what you expected. This article will make your life somewhat easier when addressing an in-app subscriptions implementation.

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Catching up with Phoenix

Phoenix started in Microsoft Research as a project for building compilers and code analysis tools. First released as a research development kit to educational institutions it is now being readied to be released to the community at large. Back in February of this year Sarah Derstadt, a Program Manager at Microsoft, announced Phoenix as a Commercial Development Kit:

Use of Phoenix within the industry is still very restricted to internal research. Over the next 6 months, the Phoenix team will be transitioning from the RDK/CDK release to our SDK. This SDK will be available through a Beta program up until we ship with a future version of Visual Studio.

Several years ago the Visual C++ was cranking out compiler backends, much as we do today, but there was a growing concern about the cost of retargeting the backend to generate code for new platforms (such as Itanium and the CLR, POWER, ARM, and later x64). Doing this retargeting was a painful process, and a small group in the VC team decided that it would be worth creating a new backend infrastructure that would allow rapid retargeting to different platforms.

On how the VC++ team and MSR team connected Kang Su continues:

On the other side of the galaxy in Microsoft Research (MSR), they were doing some of the worlds most advanced binary rewriting and static analysis research. This took place in different groups with largely overlapping functionality, yet no sharing of code. When MSR got a whiff of this new project in Visual C++ land they were intrigued. Eventually, Visual C++, MSR, and the CLR teams decided they should join forces to create a new project which not only would be a rapid retargeting backend, but a new platform for doing program transformation and analysis.

And on the intended result of their joint work he concludes:

Additionally, the teams agreed Phoenix should be the code generation platform for all of Microsoft.

In July, Microsoft released a pre-release version of the SDK on Connect. Phoenix provides a wide variety of building blocks for implementing a common intermediate representation such as:

block analysis

memory tracing

code coverage

fault injection

run-time profiling and feedback

ahead-of-time compilers

just-in-time compilers

code optimization

whole program

post-link

runtime

Microsoft intends to move from their current list of over 25 code generators to a single platform based on Phoneix. What further makes Phoenix potentially groundbreaking is the introduction of transparency into the compiler and code generation process. Thus, breaking the traditional model where the compiler is a black box.